Crypt-DSA-1.21

Security Advisories (1)

CVE-2026-14570 (2026-07-05)

Crypt::DSA versions before 1.22 for Perl draw the DSA signing nonce and private key from a biased random generator, leading to private-key recovery. "Crypt::DSA::Util::makerandom forces the high bit of every value it returns to obtain an exactly N-bit integer for prime search. The signing nonce and the private key are drawn from makerandom. Because the high bit is always set, the result is not uniform: its top bit is fixed, producing insecure values." An attacker who collects a modest number of signatures under an affected key, together with the public key, can recover the private key with a lattice attack. Keys used to sign with an affected version should be considered compromised and new keys should be generated.

Deprecated.

The maintainer of this distribution has indicated that it is deprecated and no longer suitable for use.

Changes for version 1.21 - 2026-06-14

This module is now makred as deprecated. Crypt-DSA-GMP is a possible replacement.
Fixed CVE-2026-12205 key material reuse for multiple signing events
SECURITY (CWE-323): sign() reused the DSA nonce k across signatures (r and k^-1 were cached on the key and not regenerated), allowing private-key recovery from two signatures over different messages. Now generates a fresh nonce per signature. Keys used to sign more than once with an affected version should be considered compromised.